DD is 15. Her friend is also 15
Friend's DD has recently done something that she shouldn't have done. My DD was out with her at the time, along with some other friends, but went home when the friend started doing it as she's a pretty sensible girl and doesn't like to get involved in any trouble.
The friend's parents contacted the school and DD was hauled into the head teacher's office and got a telling off even though she wasn't involved.
I then spoke to the friend's mum about it and said DD wasn't involved but she refused to believe me and keeps phoning up and making references to said bad behaviour and seems to think my DD is as bad as hers. She refuses to accept her DD was the only one at fault and seems to want to deflect the blame onto DD. I've also heard that she's mentioned it to other parents too and made out my DD took part.
Sorry this is so vague but I'll give my identity away if I am specific about what happened. It's nothing illegal btw, but something that is dangerous for a teenage girl to do.